Bearing assembly

Abstract

A lubrication film 5 is formed of a solid lubricant including PTFE (polytetrafluoroethylene) having a mean molecular weight of not more than 25,000 and a mean particle size of not less than 5 μm and less than 10 μm. The films 5 adhere to balls 3, raceway tracks 1a, 2a and a retainer 4 of a bearing assembly. The solid lubricant thus adhered to each portion has a property that PTFE particles are dispersed without a binder.

What is claimed is: 
     
       1. A bearing assembly comprising: a roller body;   a raceway track for guiding said roller body; and   a lubrication film formed of a solid lubricant adhered to at least one of surfaces of said roller body and said raceway track with a property that particles of lubricant are dispersed in binder-less condition, said solid lubricant including polytetrafluoroethylene having a mean molecular weight of not more than 25,000 and a mean particle size of not less than 5 μm and less than 10 μm.   
     
     
       2. A bearing assembly as set forth in claim 1, wherein said polytetrafluoroethylene has a mean molecular weight of between 7,000 and 15,000. 
     
     
       3. A bearing assembly comprising: a roller body;   a raceway track for guiding said roller body;   a retainer for retaining said roller body; and   a lubrication film formed of a solid lubricant adhered to at least one of surfaces of said roller body, said raceway track and said retainer with a property that particles of lubricant are dispersed in binder-less condition, said solid lubricant including polytetrafluoroethylene having a mean molecular weight of not more than 25,000 and a mean particle size of not less than 5 μm and less than 10 μm.   
     
     
       4. A bearing assembly as set forth in claim 3, wherein said polytetrafluoroethylene has a mean molecular weight of between 7,000 and 15,000.